#!/usr/bin/env python3
# -*- coding: utf-8 -*-

# @Time: 2024-02-29 22:54
# @Despcription: 

if(1):
    lst = [5, 5, 4, 4, 2, 3, 2, 1, 2, 2, 5, 4, 3, 4, 5, 1]
    print(set(lst)) # {1, 2, 3, 4, 5}